A customer recently brought me a Les Paul Studio with one of these installed. I've never seen anything quite like it. Evertune makes them for tele, strat, Gibson, etc and also markets a number of popular guitars with the system factory installed. Their website says the Evertune system will keep the guitar in tune under any and all conditions. They are pricey and crazy invasive. I must admit, the LP did stay in tune well, but that could also be attributed to a good set-up.